The invention discloses a membrane bioreactor for sewage treatment. The membrane bioreactor comprises a tubular membrane, a shell and aeration sludge jet equipment, wherein the tubular membrane is fixedly connected with the shell through a sealing adhesive or a seal ring; the outer wall of the tubular membrane and the shell form a sealed clear water side; the aeration sludge jet equipment is arranged at the lower parts of the shell and the tubular membrane; and by using an intermittent running mode, the aeration sludge jet equipment intermittently allows the air aeration and sludge jet into the tubular membrane; and the shell is connected with a clear water outlet. The structure can reduce the energy consumption and improve the anti-fouling performance.